Real-time Correlation of PM2.5 Concentration of Air Quality Meter with Standard Instrument

Abstract

This research looked at the correlation between a real-time air quality monitor (CKDPM) and a standard instrument. Both instruments were based on the principle of light scattering. The reference standard instrument, Dust Trak 8533, was used to collect PM_2.5 concentrations of samples in 3 locations, namely Faculty of Public Health, Khon Kaen University, the area of the Police Station, Muang District, Khon Kaen Province and at a sugar factory in Khon Kaen Province. The samples were collected for 12 days by recording data every 30 minutes from 8:00 am to 8:00 am of the other 24 hours a day. The real-time (CKDPM) with the Dust Trak 8533 in each location was highly correlated with r values of 0.9350, 0.9347, and 0.8711 respectively. CKDPM was lower than the Dust Trak 8533, however, the two instruments that were installed together were 93% related. So the researchers predicted the concentrations obtained from real air quality meters. Time (CKDPM) using the simple regression equation (Simple Linear Regression) found that the concentration of PM_2.5 obtained from the CKDPM machine increased by 1 microgram per cubic meter. The concentration of PM_2.5 obtained from Dust Trak 8533 increased by 2.354646 micrograms per cubic meter. The concentration accuracy obtained from the Real-Time Air Quality Monitor (CKDPM) was similar to that of the Dust Trak 8533.